Fox Williams works with established corporates and technology sector entrepreneurs, providing immigration input alongside employment advice. The firm has particularly strong links with the USA, and assists a number of American businesses looking to establish operations in the UK. Clients describe the firm's commitment to "high-quality advice" and value the commerciality of its solutions.

This immigration unit is a dedicated component of the wider firm's employment department. It focuses on employer-side immigration issues such as compliance, licence applications, and work arising from distressed situations, although it does also handle a proportion of work on behalf of individuals. The firm's general strength in the professional and financial services and technology industries means the team receives a steady stream of clients from these sectors.